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Figure 7
(a) Weights of the first two principal components (PCs) as a function of emission energy Eem. A visual inspection makes it immediately apparent that the first PC can be interpreted physically as the satellite (p1) and the second (and higher) PCs correspond to (correlated) noise (p2). The satellite closely resembles the initial estimate in Fig. 6 but with increased structural detail. The first component of noise has a higher magnitude in the vicinity of the Kβ2,5 peak, a consequence of the larger intensities and hence noise in that region. (b) Fraction of the total variance explained by each subsequent PC. The satellite component accounts for over 95% of the variance across the background-subtracted XR-HERFD data set. Hence we can focus on the satellite component without sacrificing any loss of information.

IUCrJ
Volume 12| Part 5| September 2025| Pages 548-562
ISSN: 2052-2525
https://doi.org/10.1107/S2052252525005573